Source position: jwawinuser.pas line 4222
function UpdateLayeredWindow(
hWnd: HWND;
hdcDst: HDC;
pptDst: LPPOINT;
psize: LPSIZE;
hdcSrc: HDC;
pptSrc: LPPOINT;
crKey: COLORREF;
pblend: LPBLENDFUNCTION;
dwFlags: DWORD
):BOOL;